6896068: SunGraphics2D exposes a reference to itself while non fully initialised.
Summary: Introduce a new Interface to mark the Loops based pipes and initialise the loops accordingly.
Reviewed-by: flar, rkennke
^build/
^dist/
^nbproject/private/
^src/share/tools/hsdis/build/
^src/share/tools/IdealGraphVisualizer/[a-zA-Z0-9]*/build/
^src/share/tools/IdealGraphVisualizer/build/
^src/share/tools/IdealGraphVisualizer/dist/